反壓狀態是不良的工作狀態，介質中的顆粒、雜質很容易進入密封面，使密封失效。磨軸的主要件為橡膠波紋管，且由于上端密封面處于不良潤滑狀態，動靜環之間的摩擦力矩大于橡膠波紋管與軸之間的傳遞轉矩，從而發生相對轉動。動、靜環輔助密封由于受到污水中的弱酸、弱堿的腐蝕，橡膠件已無彈性。渣漿泵用道滘鎮機械密封的工作原理要求道滘鎮機械密封內部無任何雜質，在組裝道滘鎮機械密封前要徹底清掃動環、靜環、軸套等部件，檢查動靜環表面是否存在劃痕、裂紋等缺陷，這些缺陷存在會造成道滘鎮機械密封嚴(yan)重漏泄。必要時可以(yi)制作工裝(zhuang)在組(zu)裝(zhuang)前(qian)水壓試驗，檢查動靜環座是否存在影響密封的缺(que)陷。

　　渣漿道滘鎮泵用道滘鎮機械密封由于密封面變形所引起的，而且道滘鎮機械密封面泄漏的概率是很高的。如果泵在啟動時就發生道滘鎮泵用道滘鎮機械密封泄漏，而拆查密封面時看不見有損壞的地方，這時就應該用平晶檢查道滘鎮機械密封的變形情況(kuang)。如果(guo)發(fa)生(sheng)變形，用(yong)平(ping)晶檢查密封面的干涉帶的變化情況(kuang)，密封面變形存在于(yu)動環(huan)和靜環(huan)之間。

　　壓(ya)缸(gang)體(ti)動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)封(feng)系統采用(yong)(yong)(yong)的(de)是主密(mi)(mi)(mi)(mi)封(feng)設計，一般(ban)都(dou)用(yong)(yong)(yong)U型(xing)密(mi)(mi)(mi)(mi)封(feng)圈(quan)。液(ye)壓(ya)缸(gang)體(ti)的(de)往復(fu)式(shi)動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)封(feng)系統的(de)設計，開始使(shi)用(yong)(yong)(yong)了更加(jia)復(fu)雜的(de)U型(xing)圈(quan)和(he)(he)同軸(zhou)密(mi)(mi)(mi)(mi)封(feng)組件的(de)復(fu)合(he)式(shi)設計。密(mi)(mi)(mi)(mi)封(feng)的(de)靜環(huan)(huan)通(tong)常(chang)固定在殼(ke)體(ti)上，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)通(tong)過(guo)彈簧(huang)、彈簧(huang)座與(yu)軸(zhou)一同旋轉。靜環(huan)(huan)與(yu)殼(ke)體(ti)、動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與(yu)軸(zhou)形成的(de)間隙用(yong)(yong)(yong)成型(xing)填料密(mi)(mi)(mi)(mi)封(feng)。在動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)(he)靜環(huan)(huan)接觸(chu)的(de)端面(mian)形成相對滑動(dong)(dong)(dong)(dong)(dong)面(mian)，即動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)。為保(bao)證密(mi)(mi)(mi)(mi)封(feng)良(liang)好(hao)，動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)面(mian)應十(shi)分(fen)平直和(he)(he)光潔(jie)。彈簧(huang)力和(he)(he)被密(mi)(mi)(mi)(mi)封(feng)的(de)流體(ti)壓(ya)力使(shi)動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)貼(tie)緊(jin)靜環(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)與(yu)軸(zhou)通(tong)過(guo)彈簧(huang)連接，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)和(he)(he)靜環(huan)(huan)間貼(tie)合(he)性(xing)受軸(zhou)的(de)振(zhen)動(dong)(dong)(dong)(dong)(dong)和(he)(he)擺(bai)動(dong)(dong)(dong)(dong)(dong)影響(xiang)較小。靜環(huan)(huan)一般(ban)常(chang)用(yong)(yong)(yong)潤滑性(xing)好(hao)的(de)軟質(zhi)材(cai)料如石墨、填充聚(ju)四氟乙烯等，動(dong)(dong)(dong)(dong)(dong)環(huan)(huan)多用(yong)(yong)(yong)硬質(zhi)合(he)金、陶瓷等材(cai)料制造。